Some time ago I described similar, 170 V DC power bank, but it did not work well. The battery holders, made in Far East, had lousy, unreliable contacts. Their wires were very thin (however, I could use it with 120 V AC hammer drill for a few minutes...).
For re-charging, I had to remove all batteries.
This second prototype avoids previous flaws.
The shell for batteries was made with Lexan tubes, glued with marine resin glue.
The weight of this bank is about 7.5 lb (3.4 kg). The Li-ion, 18650 batteries (also used in Tesla car) were salvaged from used laptop batteries, thus cost me nothing. And their capacity (after selection) was much better than capacity of batteries purchased from e-bay (infamous Ultra Fire).
The multi-pin connectors used in this bank do not have too much amperage allowed, but these were available.
I found out just recently, that in UK are available 39- blade connectors, good for 10 Amps.
More description on following 7 annotated photos, below:
For re-charging, I had to remove all batteries.
This second prototype avoids previous flaws.
The shell for batteries was made with Lexan tubes, glued with marine resin glue.
The weight of this bank is about 7.5 lb (3.4 kg). The Li-ion, 18650 batteries (also used in Tesla car) were salvaged from used laptop batteries, thus cost me nothing. And their capacity (after selection) was much better than capacity of batteries purchased from e-bay (infamous Ultra Fire).
The multi-pin connectors used in this bank do not have too much amperage allowed, but these were available.
I found out just recently, that in UK are available 39- blade connectors, good for 10 Amps.
More description on following 7 annotated photos, below:
