Battery Amp-Hour Calculator


1	The Joslyn Journey		BATTERY AMP-HOUR CALCULATOR					Summary to the right -> -> ->
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3	TO EDIT: Create your own copy (File - Make A Copy) - Enter Info in yellow cells that match your personal needs. - Check which rows you want to be added to your calculation. - Look at summary on cells to the right (Colums K&L)								My personal goal is to go for 2 days w/o solar (rainy or days under trees). This is a worst-case calculation. We can conserve power, move (and use our truck to charge batteries), use our generator, or even deploy our portable solar. We prefer to have LOTS of options.
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5	Include in Calculation?	What's drawing power?	How Long (in hours)	Wattage	12V or 110V?	Quantity	Ah calculation	Notes	423	Total Daily Ah needed

6		3 12V lights	5.0	6	12	3	8	Gary's always telling me to keep those lights off - I never listen. 😊
7		Fans	24.0	10	12	2	40	we have MaxxAir fans. We measured the following: Speed 10% (Lowest) = 0.1A (~1W) Speed 50% = 0.7A (~9W) Speed 100% (highest) = 2.5A (~33W)	2	Days without sun
8		Microwave (10 minutes)	0.2	1800	110	1		I tend to heat up leftovers on the stove when I'm off-grid	846	Ah needed
9		Air Conditioner	1.0	1200	110	1	105	My philosophy is that we'd use the AC for 1 hour close to when we're heading to bed.
10		Blender (10 minutes)	0.2	1800	110	1
11		Instant Pot (45 minutes)	0.8	1200	110	1		When I'm boondocking, I tend to use my Omnia Oven instead of my instant pot. Now I have a propane stove, yay!
12		Laptop	8.0	120	110	1	84	Instead of running my Victron inverter when I'm using my computer, I will sometimes use a small inverter and keep the main inverter off. I have been using this 500W Pure Sine Inverter for the past year and it's worked well - I just plug it into the 12V outlet.
13		2 Phones	2.0	25	12	2	8
14		2 Camera batteries	2.0	25	12	2	8
15		Dometic 12V Refrigerator	24.0	32	12	1	64	This was calculated off our refrigerator - at performance level 3 in an enclosed building between 60-85F throughout the day. Refrigerator has food and was at temp (so not cooling down the unit).
16		Norcold 10 cu ft 12V refrigerator	24.0	45	12	1		guesstimate - On Norcold's website, I only see 8.3A load. Since that's likely max, I assumed 7.5A x 50% duty cycle. I've seen other websites that approximate 100Ah as well. Please comment if you have better information!
17		Absorption Refrigerator	24.0	10	110	1		approximation
18		Victron Inverter	12.0	20	12	1	20	Turn off your inverter when you're not using 110V power when off-grid. I also have a small 12V inverter when I only need to power my laptop which draws a lot less
19		Go-Power 3000W Inverter	24.0	25	12	1		Turn off your inverter when you're not using 110V power when off-grid. I also have a small 12V inverter when I only need to power my laptop which draws a lot less
20		Cerbo GX and GX Touch	24.0	4	12	1	8
21		3 MPPTs during the day	12.0	0.3	12	3	1	MPPTs will use 25mA of current when they are not charging. Not enough to get worked up on, but it's in here.
22		Water Heater						You would need to include this if you use the electric option. I couldn't find data about the Truma water heater (we don't have one)
23		Fireplace (electric heater) Low	1.0	800	110	1		Low would be less than the AC unit, but wouldn't be able to use all night. Better to use your propane furnace.
24		Fireplace (electric heater) High	1.0	1500	110	2		Would NOT recommend using your fireplace for warmth. This is just too much power. Better to use your propane furnace.
25		E-bike (750w battery)	3.0	250	110	1	66	This would assue that I would only need to charge 1 ebike once during a 2-day period. The hours aren't quite right, but this would assume charging from 0 to 100%
26		Nespresso coffee maker	0.1	1800	110	1	11	4 minutes. Yeah, I can use my Aeropress coffee maker but....
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