Mac, I have had good success using Full River AGM's in difficult situations. One system near the Canadian border here in Vermont had no homeowner care for two months in the winter. PV array became covered with snow and they had left their inverter on to run a refrigerator. Of course the batteries became discharged and they were in temperatures well below freezing. I was brought in to assess and service the situation. I found these 6v 250AH AGM's with about 4 volts each. I assumed they were ruined.
Nope. I brought them back to my shop and warmed them up, charged them and then did a load test and they all tested out at or above manufacturer specs. They have been working well for another three years now. David Palumbo Independent Power LLC 462 Solar Way Drive Hyde Park, VT 05655 802-371-8678 cell 802-888-4917 home From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Mac Lewis Sent: Monday, March 27, 2017 8:53 AM To: RE-wrenches Subject: [RE-wrenches] High End battery Hi Wrenches, I've got a customer that has an older off-grid system with a 5 string ~2000 Ahr (No I didn't install this) L16 battery bank that is failing. Its a Trace SW 4024 system where the batteries are located in a difficult-to-access crawl space where I'm sure they never got watered. We'd like to have these characteristics: 1. Modular (need to be able to get them to the crawl space) 2. Maintenance free 3. Able to be abused and bounce back 4. Compatible with an Outback MX 60 charge controller (preferably) 5. In case of charge controller failure, we'd like the batteries to be able to go over the winter with no charge and not be damaged 6. Need about 30-40 kWh bank size 7. Able to withstand cool temps (operate decently at 45F) withstand near freezing temps over winter (with no usage) 8. Price tag isn't a big constraint with these customers What are some batteries you might recommend? Thanks in advance -- Mac Lewis "Yo solo sé que no sé nada." -Sócrates
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