Dual battery set-up using chassis battery
Has anyone incorporated their truck's OEM 12v battery with their camper's battery(ies)? I'm brainstorming a way to do this and would appreciate some input. I'm thinking that if I run large (1/0g) ...
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Hi burningman,
Great comments!
For a 440 amp-hour bank
Efficiency
1000 watts demand
88 percent for Pure Sine Wave
1136 watts input to inverter
1136 / 12 volts = 95 amps
based on 440 amp-hour bank, Peukert corrected amps = 147
Run time to dead 3 hours
440 amp hours = 283 available (to dead)
running for one hour may consume 147 amp-hours
battery efficiency is about 90 percent on a new in great shape jar.
147 /.9 = 164 amp-hours to be replaced
164 x 12 = 1968 watt-hours
So those 1000 watt-hours require 1968 watt-hours to be put back into the bank.
The PD converter is only 70 percent efficient so 2812 watt hours are consumed in total to operate a 1000 watt load for one hour.
Overall efficiency appears to be about 36 percent, if the recharging is done from shore power.
Of course, if generator has to be run to do the recharging efficiency becomes even worse.
If you recharge with solar--then things get a LOT more efficient.
Great comments!
For a 440 amp-hour bank
Efficiency
1000 watts demand
88 percent for Pure Sine Wave
1136 watts input to inverter
1136 / 12 volts = 95 amps
based on 440 amp-hour bank, Peukert corrected amps = 147
Run time to dead 3 hours
440 amp hours = 283 available (to dead)
running for one hour may consume 147 amp-hours
battery efficiency is about 90 percent on a new in great shape jar.
147 /.9 = 164 amp-hours to be replaced
164 x 12 = 1968 watt-hours
So those 1000 watt-hours require 1968 watt-hours to be put back into the bank.
The PD converter is only 70 percent efficient so 2812 watt hours are consumed in total to operate a 1000 watt load for one hour.
Overall efficiency appears to be about 36 percent, if the recharging is done from shore power.
Of course, if generator has to be run to do the recharging efficiency becomes even worse.
If you recharge with solar--then things get a LOT more efficient.
