jkbrigman wrote:Open Questions on Batteries:
- do you "bulk charge" first at high voltage, then balance the pack, later, or intermittently?
- do you use a BMS of any kind permanently built into your batteries?
- if you DON'T have a BMS integrated into the battery, then how do you balance your cells?
- if you are using mean wells, do you have to mod the meanwells or do you just hook 'em up in series and go?
- if there is anyone charging 18S3P LiPo inexpensively, I seek your comment with data and pictures if possible
Alan B wrote:If you are going to get Methods HVC/LVC boards they have the JST-XH's for up to 7P already installed. You might want some JST-XH extension cables, plus the double female from Methods to balance charge through the HCV/LVC board.
jkbrigman wrote:Alan B wrote:If you are going to get Methods HVC/LVC boards they have the JST-XH's for up to 7P already installed. You might want some JST-XH extension cables, plus the double female from Methods to balance charge through the HCV/LVC board.
Alan - I think you just answered a lingering question I had: can methods LVC/HVC boards charge through the balance connector WITHOUT the high-current harness? I thought they could NOT, so I put off the methods boards and planned to make my own...
veloman wrote:Are you considering adding a front fairing and/or rear tailbox? Adding both you would probably go from 25mph to 28mph realistically. The rear tailbox would hide your hub motor and make you look very stealth, plus added cargo room.
I will one day do a recumbent build. I'm held back by where I live is not conducive to fast non-stop riding, and lots of cars. In the future more bikeways will be built though. Your build log is very organized. I need to take notes for my threads, lol.
Alan B wrote:On my 18S bike there are two charging scenarios. One is "bank balance charging" and each 6S bank is charged separately. They are still in series all the time, so a 25V difference exists between their grounds so care is required - either charge only one of three "banks" at a time, or use three chargers each with separate power supply. I use one charge rand plug it in three times. For bulk charging I use a 4.15V per cell 4 amp bulk charger that shuts itself down. The HVC function opens up the charging circuit (when I get that part done) for an extra safety net. For monitoring checks I use a celllog wired to a DB9 plug so I can quickly plug it in and check six cell voltages at a time on a bank. So three plug-in cycles are required to observe all 18 cell voltages.
The Cycle Analyst is really the first line of defense against overdischarge. Setting the pack low voltage per cell to 3.6 provides good protection, and watching the amp-hour discharge allows staying away from even getting that low. The board level LVC is the third layer of defense against overdischarge.
So in summary we have defense in depth. On charging there are two layers, one is the charger itself and the other is HVC protection. On discharge we have three layers - amp-hour metering, pack voltage monitoring cutoff and low cell voltage cutoff.
Alan B wrote:How is it coming, James?
I've never ridden a recumbent. Was doing some reading on it, I like the idea of better comfort for long rides and better efficiency. Is it controllable enough to deal with traffic with confidence?
Alan B wrote:The pins need to have the right grooves to lock into the housings. They are always sold as a set that I know of. EPBuddy may have them, or Hobbyking. Also eBay.
Alan B wrote:How's progress here?
I didn't quite make the Mega ride today, unfortunately, but I did make progress and managed a pedaling test after dark with the hubmotor installed. Tomorrow I should be able to complete the wiring and do an electric test run.
For details see bikeE thread in my sig.
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