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Licensed in 2009 in Seattle, WA Focus on Portable Solar Operating

Batteries are rated in Amp Hours AH rating is generally “20 Hour” rate

100% Depth of Discharge Voltage after 20 hours AH/20 = Constant Discharge Current

Peukert Effect Generally, as Discharge Current increases useable capacity of

battery decreases Chemistries

Lead Acid Lithium (LiPo, LiOn, LiFePO4, etc)

Absorbed Glass Mat (Pb) 12.6-12.8V Nominal (~ 2.1V /

Cell x 6 Cells) 10.5V at 100% Depth of

discharge – ideal usage is 50% (12V)

11.8V is 70% Depth of discharge

~100-500 Discharge Cyles Inexpensive, heavy Capacity decreases as load

current increases - Linear discharge curve

LiFePO4 12.8-13.2V Nominal (~3.3V / Cell

x 4 Cells) 10V at 100% Depth of

Discharge – ideal usage is 80% (12V)

11.8V is 90+% Depth of Discharge

~1000-2000 Discharge Cycles Expensive, light Capacity less affected by

discharge current - Flat discharge curve

Sources - http://www.batteryuniversity.com/

Battery Price AH LBSMin

CyclesMax

Cycles $ / AH AH / LB$ / Rated Lifetime

AH Min$ / Rated

Lifetime AH Max

A123 ALM-12V7

$135 4.6 2 1000 2000 $29 2.30 $0.029 $0.015

AGM $25 9 6 100 500 $3 1.50 $0.028 $0.006

BioennoBLF-1208LB

$95 8 2.4 1000 2000 $12 3.33 $0.012 $0.006

Constant Current Tests (250mA, 1A, 10A) Duty Cycle (250mA/3A, 1A/10A)

Simulate 60S:30S Ratio of Receive / Transmit Test directly from charger Discharge to 11.8V at the Load

Most radios are 13.8V +/- 15% (11.73V – 15.87V) Maynuo M9712 Programmable DC Load

0-150V, 300Watts

Battery Total AH % Rating Runtime $/AH AH/LBA123 4.801 104% 19:15:49 $28.12 2.40AGM 5.384 60% 21:33:35 $4.64 0.90

Bioenno 7.734 97% 30:48:28 $12.28 3.22

Battery Total AH % Rating Runtime $/AH AH/LBA123 4.750 103% 4:46:25 $28.42 2.37AGM 4.582 51% 4:36:20 $5.46 0.76

Bioenno 7.675 96% 7:42:40 $12.38 3.20

Battery Total AH % Rating Runtime $/AH AH/LBA123 4.485 97% 0:27:06 $30.10 2.24AGM 2.051 23% 0:12:21 $12.19 0.34

Bioenno 7.318 91% 0:44:12 $12.98 3.05

Battery Total AH % Rating Runtime $/AH AH/LBA123 4.717 103% 4:03:51 $28.62 2.36AGM 4.086 45% 3:30:57 $6.12 0.68

Bioenno 7.662 96% 6:34:52 $12.40 3.19

Battery Total AH % Rating Runtime $/AH AH/LBA123 4.573 99% 1:09:10 $29.52 2.29AGM 2.443 27% 0:37:21 $10.23 0.41

Bioenno 7.359 92% 1:51:15 $12.91 3.07

If you are cheap and lose batteries easily, stick with AGM

If you want high performance, light weight batteries, consider LiFePO4

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