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Old 10th April 2016, 03:13 PM   #1
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Default Inexpensive B+ Batteries

Size doesn't matter. No in this case it really doesn't. If one were to build a rechargeable battery array for B+ (180V or more) what would be the cheapest/most cost effective batteries to use? I don't mind having to make a switch to charge in parallel and discharge in series.
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Old 10th April 2016, 03:17 PM   #2
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Sounds extremely dangerous!
What current do you want?
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Old 10th April 2016, 03:19 PM   #3
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The old PP9 batteries in series. Expensive though.
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Old 10th April 2016, 03:33 PM   #4
Mooly is offline Mooly  United Kingdom
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Switching a bank of batteries from series to parallel could get interesting given that they will all be at slightly different levels of charge.

Nothing like this is impossible, but it doesn't sound very practical on all fronts.
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Old 10th April 2016, 03:43 PM   #5
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I agree with Mooly, used in series, charge in series or charge individually.
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Old 10th April 2016, 04:16 PM   #6
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Quote:
Originally Posted by mashaffer View Post
Size doesn't matter. No in this case it really doesn't. If one were to build a rechargeable battery array for B+ (180V or more) what would be the cheapest/most cost effective batteries to use? I don't mind having to make a switch to charge in parallel and discharge in series.
How much current / power ?

If 30w is ok the a 12V lead accu + a dc/dc converter :
DC DC Boost Converter 8 32V 12V to ±45V 390V High Voltage ZVS Capacitor Charging | eBay

this combo will use any 12V power and give an adjustable B+ from 90 to 390V
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Old 10th April 2016, 06:55 PM   #7
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a few hundred mA tops.
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Old 10th April 2016, 07:01 PM   #8
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Lead acid such as lawn mower or marine deep cycle batteries are an obvious choice of course but I ran across these new LiPo batteries which look interesting but not sure about charging requirements. With lead acid the cheap car battery charger in the garage can be used. other options will need to consider the purchase or building of a suitable charger.
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Old 10th April 2016, 07:38 PM   #9
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15 VRLA's of say 3 Ah capacity would cost around £140+ here from a reputable supplier. For the cost and all the hassle you could build a first class mains supply for that.

You can't use a car battery charger on VRLA's though.
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Old 10th April 2016, 07:46 PM   #10
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RC lipo bricks in series. Quite strong, will start the Civic too.
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