We got our original information from the
\Lithium Ion Batteries for RVs | Technomadia
Our son Cary is an alternative energy designer and installer. He should have paperwork signed today or tomorrow for sub-contract on a 1.5 megawatt solarsystem. He designed our system using LFP batteries from Manzanite Micro
They primarily fabricate LFP battery packs for vehicles (autos, boats and motorcycles).
We have 1.4 kW of solar, 4.0 kW pure sine-wave inverter and 4 LFP battery packs in series for 54 V (nominal). Power comes from solar at 54 V and then goes to inverter and/or 12 V converter. The battery pack system stores 9.7 kW-hours (720 amp-hours at 12 V nominal) for a total weight of 160#. LFP can be discharged to 20% capacity for thousands of discharges and down to 10% for several hundred while PbS can only be safely discharged down to 50%. We would have had to had around 800# of PbS for equivalent power storage.
We undoubtedly went overboard but Cary designed the system to be autonomous. We have run the 1.5 kW air conditioner for over 3 hours as combination of solar and battery discharge. We did not get down to 50% capacity doing this.
We are exceptionally pleased with the results and have not hooked into shore power except to test out the battery chargers. Have dumped 50 amp cable and now will only utilize 15 amp extension cord to run system.
Reed and Elaine Cundiff