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AfterFranklinWH Solar Battery Storage & Backup: The San Jose Owner’s Guide
We stock, install, and replace FranklinWH solar battery storage and backup components across San Jose, and most jobs run between $650 and $2,800 installed depending on which part failed and how your aGate or aPower is configured. Same-day service is usually available when we’re in your zip code, and we carry the common failure points on the truck. Most San Jose owners discover the problem the same way: the aGate app throws a fault code, the battery stops discharging during peak rates, or a PG&E outage hits and the backup doesn’t kick in. Here’s what we’ve learned fixing these systems in the South Bay since FranklinWH started showing up on local roofs.
Which FranklinWH Models This Applies To
FranklinWH keeps their lineup simple compared to most battery makers, which is good news for parts matching. The system is built around two pieces: the aPower battery module (which holds roughly 13.6 kWh of storage) and the aGate energy management controller (which decides when to charge, discharge, and switch to backup). If you have a FranklinWH system in San Jose, you almost certainly have at least one aPower paired with one aGate. Early installations from 2022 and 2023 are hitting their first real service cycle now, and that’s most of what we see for parts work.
Before ordering or swapping anything, check the model tag on the side of the unit. The aGate will show a serial starting with “AG” and the aPower will show “AP.” We also need to know whether your system has a Smart Circuits module (the small add-on that lets you back up individual loads like a refrigerator or well pump without backing up the whole house). That’s an easy part to overlook, and it has its own failure points that don’t show up on a standard aPower fault code. FranklinWH does not sell parts directly to homeowners, so if you’re trying to source something yourself you’ll end up on a forum or a third-party site with no warranty attached. We buy directly through authorized distribution and can tell you whether the part on your wall is still under FranklinWH’s 12-year warranty before you spend a dime.
Signs Your FranklinWH Solar Battery Storage & Backup Is Failing
- aGate throws a ground fault or overcurrent error that won’t clear. This usually points to a failed relay or internal breaker inside the aGate itself. We’ve replaced more aGate internal breakers in San Jose homes than any other FranklinWH part, and it’s a 45-minute fix when we have the unit on hand.
- Battery discharges fine but will not recharge from solar. That’s typically the DC/DC converter or a communication fault between the aPower and the aGate. Sometimes it’s a firmware mismatch that a reset fixes; other times the charging board itself is done.
- Backup does not engage during a PG&E outage. The transfer switch inside the aGate is the prime suspect. FranklinWH’s transfer logic is software-driven, but the physical contactor can weld or wear out, especially in older units that have cycled through dozens of outages.
- You hear a humming or clicking from the aPower that wasn’t there before. That’s often the cooling fan or the internal contactor. We can replace the fan assembly without pulling the whole battery, which saves most San Jose owners about $1,200 versus a full swap.
- App shows one aPower at 0% while the other reads normally. In multi-battery stacks, one failed module can drag down the entire string. We isolate the bad module, test independently, and replace only what’s actually dead.
Replacement Cost & What’s Included
FranklinWH part replacement in San Jose runs on a pretty predictable scale, and we quote it the same way every time: the part cost, the labor to swap it, and nothing else.
- aGate internal breaker or relay replacement: $350-$650 installed
- aPower cooling fan assembly: $400-$750 installed
- aPower DC/DC converter board: $800-$1,400 installed
- aGate full unit replacement: $1,800-$2,800 installed (varies with your system’s age and whether we’re reusing existing conduit runs)
- Smart Circuits module replacement: $500-$900 installed
Every quote includes the part, the labor, testing after the swap, and a written confirmation that the system is communicating properly with FranklinWH monitoring. If your unit is still under FranklinWH’s warranty, we handle the claim paperwork and you pay only labor. The price we quote on the phone is the price on the invoice. No trip charge inside Santa Clara County, and Gus’s Solar has been doing this in San Jose since 2011.
DIY or Call Us?
You can safely do a few things on your own: check the breakers on the aGate, reboot the system through the app, and look for obvious physical damage like rodent chews on exposed wiring or water staining around the unit. That’s about where it ends. The aGate and aPower are grid-interactive equipment carrying both AC and DC voltage, and the aPower in particular holds enough stored energy to cause serious injury even when the grid is down. We’ve seen homeowners in San Jose open an aPower thinking it was dead, only to find the internal bus still live. If the fault persists after a reboot, call us at (877) 550-6892 and describe what you’re seeing. We’ll tell you over the phone whether it’s a truck-roll or something you can handle from the app.
FAQs
FranklinWH rates the aPower at 12 years or roughly 6,000 cycles, whichever comes first. In San Jose’s climate you lose a little to heat if the unit sits in a south-facing garage that hits 100°F in August, but most systems we see are still above 85% capacity at year five. If you’re at year eight or nine and seeing faster drain, call (877) 550-6892 and we’ll run a capacity test before recommending any replacement part.
Yes, in about half the cases. Fans, breakers, relays, and wiring harnesses are all repairable at the component level, and we keep those parts on the truck for San Jose service calls. The main boards and the battery cells themselves are sealed units; when those fail, the whole module gets swapped. Here’s what we’d do if it were our roof: run the diagnostic first, then replace only what failed. We don’t sell a full battery when a $500 fan assembly fixes the problem.
Most single-part replacements take between 45 minutes and three hours once we’re on site. An aGate breaker swap is under an hour. A full aPower replacement runs about half a day because we test the new unit, update firmware, and verify communication with both the aGate and FranklinWH monitoring before we leave.
We stock the common failure items on our San Jose service trucks: aGate internal breakers, cooling fans, contactors, and wiring harnesses. Less common parts like a full aGate or aPower module usually take three to five business days from our distributor. If you call (877) 550-6892 and describe the fault, we can usually tell you same-day whether it’s a stocked part or a lead-time part.
Call Gus’s Solar for FranklinWH Parts in San Jose
If your FranklinWH system is down or acting up, call (877) 550-6892 and you’ll get a live person, not a voicemail. We’ll ask what the app is showing, tell you whether it’s urgent, and give you an honest assessment of what the fix costs. We serve all of San Jose, Willow Glen, Almaden, Evergreen, Campbell, and the surrounding South Bay. Free second opinions on any written estimate, $40 off any repair over $200, and a senior and veteran discount that never expires. Take two weeks. Think about it. The price will be the same.
Written by Gus Petrakis, Owner, Gus’s Solar at Gus’s Solar, serving San Jose and nearby areas.