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Connecting solar modules (DC) – 1-/2-MPPT operation M88H_121 (ST)
DANGER
Modified design of the DC inputs
The design of the DC inputs on the DC terminal
block has changed in comparison with previous
versions of the M88H_121 (ST)!
► You must comply with the correct use of plus
(+) and minus (-) when connecting the DC
cables.
The M88H_121 (ST) is designed by default for operation with 2
MPP trackers (MPPT). To accomplish this, the operating point
for the two DC inputs is adjusted separately. In cases of 2-MPPT
operation, two cables are connected per DC input (DC1 and
DC2), one each for DC+ and DC–.
DC cabling for 2 MPPT operation when using aluminum cables
with Al-Cu crimped connectors
As an alternative, the M88H_121 (ST) can be operated with only
1 MPP tracker. If this is the case, then the DC connection pro-
ceeds with only 2 cables (1 cable each for DC+ and DC–).
Phoenix Contact jumper for operation with 1 MPP tracker
In addition, 2 jumpers from Phoenix-Contact are required (Phoe-
nix order number EB 2-31/UKH - 0201388 for UKH 150). The
jumpers are not included in the scope of delivery and must be
ordered separately from commercial outlets
Quick Installation Guide for Solar Power Inverter M88H EU V3 EN 5013240202 02 2018-03-22
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