For various reasons, I'm thinking I'll be going with a Lithium battery bank on our short bus. As for usage, in the short term, I'd like to power a laptop for up to 10 hours a day (65W max), our water pump (Shurflo 408
sufficient for a navy shower and a little water at the sink, a couple LED lights for a few hours, and a phone charger. I'd like to try to run these for up to 2 days between charges, at which point I'd plug into a 110v outlet to charge. For now we'll use all 12v wiring and outlets in the bus (12V adapters for the phone and computer).
I'll be looking at adding solar to augment any shore power charging we would do, and eventually an inverter and 110V wiring, but for simplicity and cost, that'll come later -- just a 110V shore charger is all for now.
Anyway, this raises a number of questions I'm not sure of...
1. Would a 50 amp-hour battery be sufficient for this load? I understand with a lithium battery, I should expect about 40 amp-hours usable power, maybe a bit more, as they can take ~85% DoD.
2. If (when?) I add more power after a year or two, does it hurt to add a second battery to the bank at that time? I know with traditional batteries, it's best to get all new at one time, but with lithium it's cost-prohibitive, so if that's the case here as well, better to get more battery up front. If not, I'd rather save the up-front cost for now.
3. It seems hard to find shore power chargers and solar MTTP chargers designed for lithium batteries. So far I've found a couple made by AIMS (but the shore power charger comes with an inverter I don't need now, along with the extra cost). Are there other stand-alone 110V chargers or MPPT solar chargers that I should consider that are good for lithium batteries?
4. If I'm plugged into shore power, will a 110V charger continue to work to charge the battery while I'm drawing from the battery for the items above?
Thanks in advance!