![]() ![]() Each is measuring the battery and deciding if it needs charging or not. ![]() You can connect multiple 12 volt loads and chargers to the battery-and each, more or less, thinks it is the only device connected to the battery.įor example, you have 3 charging devices connected to the battery. Think of the Battery as the "center" of your system. Normal flooded cell batteries need to be quickly recharged when below 75% state of charge-or their overall life will be much shorter. Solar panel + Charger Controller costs, if spread out over 20 years and the system is used much of the year, can be below $0.50 per kWhr.Īnother advantage for AGM batteries (at least Concord claims) that they don't have sulfate hardening issues-so you don't have to charge them right away after they drop below 50% State of Charge. Fuel costs are around $1.00 per kWhr for a Honda eu2000i class genset. #Exide nautilus gold battery charger manual generatorYou can also use these numbers to justify solar vs generator power if you do a lot of camping (near constant use over a decade or two-or if the generator noise bothers you). Also quickly tells me if I made any mistakes in assumptions (if the price/kWhr is >$1.00 or way under $0.10 per kWhr) Don't know if you could find anything in the smaller battery sizes.Īlso, I would do the pricing in $/kWhrs-sort of gets the numbers into terms that we generally use to purchase electricity (home power is around $0.10-$0.35 per kWhr. Some better deep cycle flooded cell batteries should last longer-some of the large forklift style are rated out to 2,000-4,000 cycles. Re: Let's build a system - Batteries firstĮxactly how I would figure out costs over time when comparing batteries. It seems that because the AGM batteries can cycle 1000 times versus the 300 times (at 50% dod) for flood cells the AGM are 1/2 the lifetime cost of the Trojans even though they cost twice as much.Īlso, I ran the numbers for an Exide Nautilus gold and came up with a Cost / 10000 ah of $79.42. In looking at all my options I ended up back at the batteries. I started looking into solar to 1) extend past 4 days and 2) use more power. ![]() My wife likes the stove fan on when she's boiling water. BUT it's getting colder and we'll want to run the furnace. If I assume a 50% dod over 4 days that means I consume 13.6 ah / day. As a rough estimate the current batteries have about 108 ah - TOTAL. Right now I have 2 interstate batteries - one came with the trailer the other I picked up from WalMart. Hi All - I've been reading for a while and gleaned some great knowledge here. ![]()
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